The class configuration in spring cannot use a string in properties

1. For example, in a.properties we declare a variable:

Classroom=com.wc82.classroom

2. Then in the spring configuration file: Applicationcontext.xml, like the following configuration:

<id= "Classroom"  class= "${classroom}"  /> 

Such a configuration is not possible, will be error:

caused by:java.lang.ClassNotFoundException: ${classroom}at Java.net.urlclassloader$1.run (urlclassloader.java:366) At Java.net.urlclassloader$1.run (urlclassloader.java:355) at java.security.AccessController.doPrivileged (Native Method) at Java.net.URLClassLoader.findClass (urlclassloader.java:354) at Java.lang.ClassLoader.loadClass ( classloader.java:425) at Sun.misc.launcher$appclassloader.loadclass (launcher.java:308) at Java.lang.ClassLoader.loadClass (classloader.java:358) at Org.springframework.util.ClassUtils.forName ( classutils.java:247) at Org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass ( abstractbeandefinition.java:395) at Org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass (abstractbeanfactory.java:1348 ) at Org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass (Abstractbeanfactory.java : 1319) ... Ten more

However, the following configuration is possible:

<name= "Calssoom"  value= "${classroom}"></  Property>

The class configuration in spring cannot use a string in properties